I just watched the part where Manik says "No one leaves someone like that if it's love." So that tells me that he never loved Alya and he can never leave Nandu.
Exactly...he will never leave her!!! Remember " I will not leave you now" ?😉 and Nandini''s " Chahe kuch bhi ho, they will never get separated. They will always be together, They are UNBREAKABLE"